Lycoperdon mammiforme

About

Lycoperdon mammiforme is a rare, inedible type of puffball mushroom in the genus Lycoperdon, found in deciduous forest on chalk soil. It is found in Europe. The fruit body is spherical to pear shaped, at first pure white with slightly grainy inner skin and an outer skin which disintegrates in flakes that are soon shed, later ochre, chocolate-brown when old, up to 7 cm (2.8 in) in diameter.

Summary from Wikipedia